implement search/search-back and search-next/prev

Closes #38.

comp.go

@@ -31,6 +31,8 @@ var (
 		"read-shell-async",
 		"search",
 		"search-back",
+		"search-next",
+		"search-prev",
 		"toggle",
 		"invert",
 		"yank",

doc.go

@@ -29,6 +29,8 @@ The following commands are provided by lf with default keybindings:
 	read-shell-async  (default "&")
 	search            (default "/")
 	search-back       (default "?")
+	search-next       (default "n")
+	search-prev       (default "N")
 	toggle            (default "<space>")
 	invert            (default "v")
 	yank              (default "y")

docstring.go

@@ -33,6 +33,8 @@ The following commands are provided by lf with default keybindings:
     read-shell-async  (default "&")
     search            (default "/")
     search-back       (default "?")
+    search-next       (default "n")
+    search-prev       (default "N")
     toggle            (default "<space>")
     invert            (default "v")
     yank              (default "y")

eval.go

@@ -262,6 +262,10 @@ func (e *callExpr) eval(app *app, args []string) {
 		app.ui.cmdpref = "/"
 	case "search-back":
 		app.ui.cmdpref = "?"
+	case "search-next":
+		app.nav.searchNext()
+	case "search-prev":
+		app.nav.searchPrev()
 	case "toggle":
 		app.nav.toggle()
 	case "invert":
@@ -405,12 +409,12 @@ func (e *callExpr) eval(app *app, args []string) {
 			app.runShell(s, nil, false, true)
 		case "/":
 			log.Printf("search: %s", s)
-			app.ui.message = "sorry, search is not implemented yet!"
-			// TODO: implement
+			app.nav.search = s
+			app.nav.searchNext()
 		case "?":
 			log.Printf("search-back: %s", s)
-			app.ui.message = "sorry, search-back is not implemented yet!"
-			// TODO: implement
+			app.nav.search = s
+			app.nav.searchPrev()
 		default:
 			log.Printf("entering unknown execution prefix: %q", app.ui.cmdpref)
 		}

nav.go

@@ -180,6 +180,7 @@ type nav struct {
 	marks  map[string]bool
 	saves  map[string]bool
 	height int
+	search string
 }
 
 func getDirs(wd string, height int) []*dir {
@@ -352,6 +353,26 @@ func (nav *nav) cd(wd string) error {
 	return nil
 }
 
+func (nav *nav) searchNext() {
+	last := nav.currDir()
+	for i := last.ind + 1; i < len(last.fi); i++ {
+		if strings.Contains(last.fi[i].Name(), nav.search) {
+			nav.down(i - last.ind)
+			return
+		}
+	}
+}
+
+func (nav *nav) searchPrev() {
+	last := nav.currDir()
+	for i := last.ind - 1; i > 0; i-- {
+		if strings.Contains(last.fi[i].Name(), nav.search) {
+			nav.up(last.ind - i)
+			return
+		}
+	}
+}
+
 func (nav *nav) toggleMark(path string) {
 	if nav.marks[path] {
 		delete(nav.marks, path)

opts.go

@@ -54,6 +54,8 @@ func init() {
 	gOpts.keys["&"] = &callExpr{"read-shell-async", nil}
 	gOpts.keys["/"] = &callExpr{"search", nil}
 	gOpts.keys["?"] = &callExpr{"search-back", nil}
+	gOpts.keys["n"] = &callExpr{"search-next", nil}
+	gOpts.keys["N"] = &callExpr{"search-prev", nil}
 	gOpts.keys["<space>"] = &callExpr{"toggle", nil}
 	gOpts.keys["v"] = &callExpr{"invert", nil}
 	gOpts.keys["y"] = &callExpr{"yank", nil}